This has been talked about before but has since been buried in our forum threads, so thought good idea to post it permanently on the boards.

A USB storage device will need to be attached to your receiver as well to do this.
To take a screenshot with your Dreamlink T1 Plus, simply depress the record button and hold it for approx 2 seconds. A message will then appear on-screen detailing the screenshot and where it is stored.

This works with all Dreamlink models and also works same way with the Formuler models too (the z7+ and the NanoZ)